OpenGL ES的：旋转自己周围的三维模型 [英] OpenGL ES: Rotating 3d model around itself

问题描述

我用的OpenGL ES在iPhone上玩，我试着用手指平移旋转模型。我发现了开源应用分子，让你做到这一点，我看那个code，但公司当谈到旋转，我的一个模式，我可以旋转，只围绕一个点遥远的空间（就像是在轨道上运行的卫星，我固定的行星）。 什么任何的建议可能是错的？ 以后我可以张贴code，也许点播（多线） 在大多数情况下是指分子，你可以在这里找到它分子

I'm playing with OpenGL ES on iPhone and I'm trying to rotate a model by panning with the finger. I discovered the open source app Molecules that let's you do that and I'm looking at that code, but when it comes to rotate a model of mine I'm able to rotate it only around a point distant in the space (like it was in orbit as a satellite and I am the fixed planet). Any suggestion on what can be wrong? I can post the code later , maybe on demand (many lines) For the most part refer to Molecules you can find it here MOLECULES

推荐答案

如果我没有记错的话，我认为你需要的模型转换到原点，旋转，然后再转换回起始位置，以获得效果，你所追求的。

If my memory serves me correctly, I think you need to translate the model to the origin, rotate, and then translate back to starting position to get the effect you are after.

我觉得有一个glTranslate（）函数，说明对象是1,0,0。然后，通过-1,0,0翻译去的起源。即用向量从物体到原点的中心去平移。

I think there is a glTranslate() function, Say the object is at 1,0,0. You should then translate by -1,0,0 to go to origin. That is translate by a vector going from the center of the object to the origin.

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